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Какой у вас корневой лейаут и ТД
setContentView(R.layout.activity_main);
mWebView = findViewById(R.id.activity_main_webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
webSettings.setSupportMultipleWindows(false);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setAllowFileAccess(true);
webSettings.setBuiltInZoomControls(false);
webSettings.setDisplayZoomControls(false);
webSettings.setLoadWithOverviewMode(true);
webSettings.setUseWideViewPort(true);
webSettings.setAllowFileAccessFromFileURLs(true);
webSettings.setAllowUniversalAccessFromFileURLs(true);
webSettings.setSupportZoom(true);
webSettings.setDatabaseEnabled(true);
webSettings.setUserAgentString(System.getProperty((String)"http.agent"));
webSettings.setDomStorageEnabled(true);
webSettings.setAppCachePath(this.getApplicationContext().getCacheDir().getAbsolutePath());
webSettings.setAppCacheEnabled(true);
webSettings.setUseWideViewPort(true);
webSettings.setLoadWithOverviewMode(true);
mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mWebView.setWebViewClient(new MyWebViewClient());
У меня что-то не так тут?